VI. METALS— Bismuth. 233 



antimony. Used for making vessels, which have been proscribed 

 by the colleges. Proust, however, has shown (Journ. do Phys. 

 for 1800) that acids boiled in pewter vessels took up none of the 

 lead, which they will not touch while tin is present ; that when 

 even a solution of sugar of lead was boiled in a pewter vessel, the 

 lead was precipitated in its metallic state, and tin extracted from 

 tlie vessel : lemon juice, diluted with water, left for a day and a 

 night in the coarsest pewter vessels, did not dissolve an atom of 

 lead, but acted only on the tin. 



TIX. 



Grain tix. From the native oxide of tin collected in the 

 Cornish stream works; equiv. '7'25. 



Tinfoil, Stanmnnfoliatiim, Stanniolum. In thin leaves ; used 

 for ornament and to cover the hind surface of looking-glasses, 

 being softened with a small quantity of quicksilver, which is 

 afterwards pressed out of it by heavy weights. 



TiN^ FILINGS, Limatiiroi stanni; — Powder of tin, Pulvis stannt. 

 Melt grain tin in an iron mortar, and stir it, while cooling, until 

 it becomes a powder, then sift it. 



GuANL'LATED TIN, Stawaim f/ranuhtum. Melt grain tin, and 

 pour it into a wooden box rubbed on the inside with chalk, put on 

 a cover that fits close, and shake it violently, till the metal is 

 reduced to powder ; wash off the chalk, and dry the grain. 

 Vermifuge, in doses of 5ij — 5ss. 



SPELTER. 



Spelter, Zinc, Zinciim. From lapis calaminaris, mixed with 

 charcoal and distilled ; or subliined, as a secondary product, in 

 the fusion of some German ores; used to produce galvanism, and 

 in fireworks ; equiv. 4"25. 



Amalgam of zinc, Amalgama zinci. To zinc 2 oz., heated 

 in a crucible, add quicksilver o oz., also heated. Used to spread 

 upon the rubbers of electrical machines. 



bismuth. 



Tin glass, Blsmutky Kfain dr f/Iftrr, Mnrrftsifft. arr/cnfca. 

 Kliquated from its ores. Used in metallic mixtures to connnuni- 

 catc fusibility ; als^) in powder, as an imitation of silver for 

 writing and painting ; equiv. 9. 



Fusible metal. Bismuth 2 oz., lead 5 oz., tin 3 oz., melted 

 together; melts in lx)iling water. Used to write on asses'* skin, 

 or paper prepared by rubbing burnt hartshorn into it; also for 

 toy-sjxx)ns, to surprise children by their melting in hot liquors. 



